LM1577, LM2577
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SNOS658D –JUNE 1999–REVISED APRIL 2013
Electrical Characteristics—LM1577-15, LM2577-15
Specifications with standard type face are for TJ = 25°C, and those in bold type face apply over full Operating Temperature
Range. Unless otherwise specified, VIN = 5V, and ISWITCH = 0.
Symbol
Parameter
Conditions
Typical
LM1577-15
Limit(1)(2)
LM2577-15
Limit(3)
Units
(Limits)
SYSTEM PARAMETERS Circuit of Figure 30(4)
VOUT
Output Voltage
VIN = 5V to 12V
15.0
V
ILOAD = 100 mA to 600 mA
14.50/14.25
15.50/15.75
14.50/14.25
15.50/15.75
V(min)
V(max)
(1)
Line Regulation
Load Regulation
Efficiency
VIN = 3.5V to 12V
ILOAD = 300 mA
20
20
mV
mV(max)
50/100
50/100
50/100
50/100
VIN = 5V
ILOAD = 100 mA to 600 mA
mV
mV(max)
η
VIN = 5V, ILOAD = 600 mA
80
7.5
25
%
DEVICE PARAMETERS
IS
Input Supply Current
VFEEDBACK = 18.0V
(Switch Off)
mA
mA(max)
mA
10.0/14.0
50/85
10.0/14.0
50/85
ISWITCH = 2.0A
VCOMP = 2.0V
(Max Duty Cycle)
mA(max)
VUV
Input Supply
Undervoltage
Lockout
ISWITCH = 100 mA
2.90
52
V
V(min)
V(max)
kHz
2.70/2.65
3.10/3.15
2.70/2.65
3.10/3.15
fO
Oscillator Frequency
Measured at Switch Pin
ISWITCH = 100 mA
48/42
56/62
48/42
56/62
kHz(min)
kHz(max)
V
VREF
Output Reference
Voltage
Measured at Feedback Pin
VIN = 3.5V to 40V
VCOMP = 1.0V
15
10
14.70/14.55
15.30/15.45
14.70/14.55
15.30/15.45
V(min)
V(max)
mV
Output Reference
VIN = 3.5V to 40V
Voltage Line Regulation
RFB
GM
Feedback Pin Input
Voltage Line Regulator
12.2
300
kΩ
Error Amp
Transconductance
ICOMP = −30 μA to +30 μA
VCOMP = 1.0V
μmho
μmho(min)
μmho(max)
V/V
170/110
420/500
170/110
420/500
AVOL
Error Amp
Voltage Gain
VCOMP = 1.1V to 1.9V
65
RCOMP = 1.0 MΩ(5)
40/20
40/20
V/V(min)
(1) All limits ensured at room temperature (standard type face) and at temperature extremes (boldface type). All limits are used to calculate
Outgoing Quality Level, and are 100% production tested.
(2) A military RETS electrical test specification is available on request. At the time of printing, the LM1577K-12/883, LM1577K-15/883, and
LM1577K-ADJ/883 RETS specifications complied fully with the boldface limits in these columns. The LM1577K-12/883, LM1577K-
15/883, and LM1577K-ADJ/883 may also be procured to Standard Military Drawing specifications.
(3) All limits ensured at room temperature (standard type face) and at temperature extremes (boldface type). All room temperature limits are
100% production tested. All limits at temperature extremes are ensured via correlation using standard Statistical Quality Control (SQC)
methods.
(4) External components such as the diode, inductor, input and output capacitors can affect switching regulator performance. When the
LM1577/LM2577 is used as shown in the Test Circuit, system performance will be as specified by the system parameters.
(5) A 1.0 MΩ resistor is connected to the compensation pin (which is the error amplifier's output) to ensure accuracy in measuring AVOL. In
actual applications, this pin's load resistance should be ≥10 MΩ, resulting in AVOL that is typically twice the ensured minimum limit.
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